Fix file retention after updates on macOS #417

This fixes issue #417 where autoupdate installer files were not deleted
on macOS, leading to accumulation of old installers.

Key changes:

- Store update files in application-specific directory
- Clear update files directory on every app launch

Other supporting changes:

- Refactor file system operations to be more testable and reusable
- Improve separation of concerns in directory management
- Enhance dependency injection for auto-update logic
- Fix async completion to support `await` operations
- Add additional logging and revise some log messages during updates

tests/unit/shared/Stubs/FileSystemAccessorWithRetryStub.ts

@@ -0,0 +1,21 @@
+import type { FileSystemAccessorWithRetry } from '@/presentation/electron/main/Update/ManualUpdater/FileSystemAccessorWithRetry';
+
+export class FileSystemAccessorWithRetryStub {
+  private retryAmount = 0;
+
+  public withAlwaysRetry(retryAmount: number): this {
+    this.retryAmount = retryAmount;
+    return this;
+  }
+
+  public get(): FileSystemAccessorWithRetry {
+    return async (fileOperation) => {
+      const result = await fileOperation();
+      for (let i = 0; i < this.retryAmount; i++) {
+        // eslint-disable-next-line no-await-in-loop
+        await fileOperation();
+      }
+      return result;
+    };
+  }
+}